Dear Professor Murdoch.
Thank you so much!!!!
Best Wishes
Yuchen Luo
On 8/12/07, Duncan Murdoch <[EMAIL PROTECTED]> wrote:
>
> Yuchen Luo wrote:
> > Dear Colleagues.
> >
> > I believe this should be a problem encountered by many:
> >
> > nls( ) is a very useful and efficient function to use if we are just to
> > display the estimated value on screen. What if we need R to store the
> > estimated parameter in a variable?
> >
> > For example:
> >
> > x=rnorm(10, mean=1000, sd=10)
> >
> > y=x^2+100+rnorm(10)
> >
> > a=nls(y~(x^2+para),control=list(maxiter = 1000, minFactor=0.5
> > ^1024),start=list(para=0.0))
> >
> > How to store the estimated value of para in this case, in a variable,
> say,
> > b?
> >
> > It is easy to display a and find all the information. How ever, I need
> to
> > fit a different set of x and y in every loop of my code and I need to
> store
> > the estimated values for further use. I have checked both the online
> manual
> > and several S-plus books but no example as such showed up.
> >
> > Your help will be highly appreciated!
>
> coef(a) will get what you want. coef() works for most modelling
> functions where it makes sense.
>
> Duncan Murdoch
>
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